The Kumbh Mela, believed to be the largest religious gathering on earth is held every 12 years on the banks of the 'Sangam'- the confluence of the holy rivers Ganga, Yamuna and the mythical Saraswati. The Mela alternates between Nasik, Allahabad, Ujjain and Haridwar every three years. The one celebrated at the Holy Sangam in Allahabad is the largest and holiest of them. The literal meaning of Kumbh is a pitcher, but its elemental meaning is something else. Even as a symbol of pitcher, Kumbh is synonymous with holy activities as in daily life a pitcher (or kalash) is an integral part of all sacred activities in Hindu culture, and this pitcher is a symbol of Kumbh.
Holy scriptures say that in a pitcher, its mouth (opening) symbolizes the presence of Vishnu, its neck that of Rudra, the base of Brahama, all goddesses in the center and the entire oceans in the interior, thus encompassing all the four Vedas. This itself establishes the significance of the Kumbh as symbolized by the pitcher. It is the symbol of spiritual awakening. It is the eternal flow of humanity. It is the surge of rivers, forests and the ancient wisdom of the sages. It is the flow of life itself.Information by courtesy:- http://kumbhmelaallahabad.gov.in